From: "Mauricio Fernández" <batsman.geo@...>
Date: 2003-06-17T20:00:32+09:00
Subject: Re: multiple blocks or proc arguments to method

On Tue, Jun 17, 2003 at 06:57:41AM +0900, Alexander Schofield wrote:
> > A> What version are you using?  I get:
> > 
> >  1.8
> > 
> > A> Was there a change in 1.7 or 1.8 with this behavior?  What would the
> > A> behavior be if "a" had used an instance variable that had been aliased
> > A> to something else in B, or a private instance variable of A?
> > 
> >  I don't know what is a "private instance variable".
> 
> Sorry I meant accessor method.  Specifically, if the instance method
> of A used an accessor method (defined in A that was private), bound to
> an instance of B would it work?  And would the bound instance method
> have polymorphic behavior-- if for example I redefined the accessor
> method in B which would bound method use (and would scope make any
> difference with this)?

Ruby always behaves "polymorphically" (sp?). It's going to send the
message to self and find the right method.

bash-2.05a$ cat a.rb
#!/usr/bin/ruby
class A
   attr_reader :foo

   def initialize
        @foo = "A"
   end

   def a(b)
      p "A#a #{b} #{foo}"
   end
end

class B < A
   attr_reader :foo

   def initialize
        @foo = "B"
   end

   def a(b)
      p "B#a #{b} #{foo}"
   end
end

a = A.instance_method("a")
p a
a.bind(B.new)[12]

bash-2.05a$ ruby a.rb
#<UnboundMethod: A#a>
"A#a 12 B"



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